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Configuration Guide - Interface Management

CloudEngine 12800 and 12800E V200R003C00

This document describes the interface management configuration, including basic interface configuration, Ethernet interface configuration, and logical interface configuration.

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Configuring FEC

Configuring FEC

Context

NOTE:

Only 25GE interfaces and QSFP28 100GE interfaces support this function.

Forward error correction (FEC) is a bit error correction technology that adds correction information to data packets at the transmit end, and corrects bit errors generated during data packet transmission at the receive end based on the correction information. FEC improves the signal quality, but increases the signal transmission delay. You can enable or disable this function based on actual requirements.

The switch supports three FEC modes: Base-R FEC, RS-FEC and None FEC.
  • Base-R FEC: can be enabled or disabled only on 25GE interfaces (including 25GE interfaces split from 100GE interfaces).

  • RS-FEC: can be enabled or disabled on QSFP28 100GE interfaces and 25GE interfaces (including split interfaces) on other cards excluding the FD (except the CE-L16CQ-FD) and FDA series cards.

  • None FEC: FEC is disabled.

FEC is a part of auto-negotiation on an interface. If auto-negotiation is enabled on an interface, the local and remote interfaces negotiate to enable or disable FEC. If auto-negotiation is disabled on an interface, the default FEC mode is used. You can configure RS-FEC, Base-R FEC, or none FEC (disabling FEC) on an interface based on the interface's support for FEC. If FEC is enabled at one end of a link, this function must also be enabled at the other end of the link.

When the negotiation status of interfaces at both ends of a link is not affected, pay attention to the following points:
  • By default, FEC is disabled on interfaces with QSFP28-100G-LR4 optical modules. According to IEEE 802.3, you are not advised to enable FEC.

  • By default, FEC is enabled on interfaces with QSFP28 optical modules excluding the QSFP28-100G-LR4 optical module. You are not advised to disable FEC because error packets may exist.

If an interface has been configured as a stack member interface, the FEC configuration command cannot be run on the interface. Similarly, if the FEC configuration command has been run on an interface, the interface cannot be configured as a stack member interface.

NOTE:
  • The default FEC mode on an interface varies according to the device model and connection medium. Interfaces at both ends of a link must work in the same FEC mode; otherwise, the interfaces do not go Up. If their FEC modes are different, configure the same FEC mode on the interfaces when they work in non-auto-negotiation mode. You can run the display interface command in any view or the display this interface command in the interface view to check whether the FEC function is enabled on an interface based on the Fec field in the command output.

  • FEC mode can be changed only if auto-negotiation has been disabled.

  • It is recommended that you simultaneously enable the FEC function on two ends of the link when 25GE interfaces are used for interconnection, reducing the transmission bit error rate of the physical link.

Procedure

  • Enable the Base-R FEC function.

    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. Run fec mode base-r

      The Base-R FEC function is enabled.

      By default, the medium on a 25GE interface determines whether the Base-R FEC function is enabled on the interface.

    4. Run commit

      The configuration is committed.

  • Enable the RS-FEC function.

    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. Run fec mode rs

      The RS-FEC function is enabled.

      By default, the medium on a 100GE interface determines whether the RS-FEC function is enabled on the interface.the RS-FEC function of converted 25GE interface depends on the auto-negotiation status.

      • When a 100GE 1-to-4 high-speed cable is installed on a 100GE interface split into 25GE interfaces, auto-negotiation is enabled on the 25GE converted interfaces, and a 25GE converted interface can negotiate with the remote interface to work in RS-FEC mode. If auto-negotiation is disabled, the RS-FEC function is in none FEC state, that is, FEC is disabled.

      • If an optical module is installed on a 100GE interface split into 25GE interfaces, the medium determines whether the RS-FEC function is enabled on the interface.

    4. Run commit

      The configuration is committed.

  • Disable the FEC function.

    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. Run fec mode none

      The FEC function is disabled.

      NOTE:

      The fec mode none command disables the FEC function and the undo fec mode command restores the default FEC mode. Therefore, if the FEC function is disabled on an interface that has an optical module installed by default, you can run the fec mode none or undo fec mode command to disable the FEC function on the interface.

    4. Run commit

      The configuration is committed.

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Updated: 2019-05-05

Document ID: EDOC1100004195

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